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S-I MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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MARGINAL REVENUE CURVE

A curve that graphically represents the relation between the marginal revenue received by a firm for selling its output and the quantity of output sold. A firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve. The marginal revenue curve for a firm with no market control is horizontal. The marginal revenue curve for a firm with market control is negatively sloped and lies below the average revenue curve.

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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either a T-shirt commemorating the 2000 Presidential election or a really, really exciting, action-filled video game. Be on the lookout for door-to-door salesmen.
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A half gallon milk jug holds about $50 in pennies.
"Nothing ever built arose to touch the skies unless some man dreamed that it should, some man believed that it could, and some man willed that it must. "

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